北极黄河站上空低热层中性风场对行星际激波的响应

行星际激波作为日地空间环境中传输能量的重要载体,与热层的相互作用可以对热层的空间环境产生剧烈影响,借助FPI设备观测的低热层中性风场行为可以对这一问题进行更加深入的研究。在行星际激波和地球磁层相互作用时期,通过全天空法布里-珀罗干涉仪(all-sky FPI)的观测数据对北极黄河站(78.92°N,11.93°E)上空低热层风场行为展开了研究,对2011年11月26、28日以及2011年12月1日OI557.7nm辐射高度(约为97km)的观测数据进行了处理,此外也将观测期间的中性大气水平风场与水平风模型2007(HWM07)进行了对比。行星际扰动数据和同时期水平风场数据的对比分析表明,ACE卫星监测到行星际激波半小时内水平风场在幅值和方向上均可以产生剧烈变化,产生变化的原因可能与焦耳加热有关。对2011年11月28日OI557.7nm辐射高度的视线风场(方向为FPI设备朝向热层大气被观测处)进行分析,结果表明在行星际扰动期间,OI557.7nm辐射高度上的风场行为变化可能也同时来自于离子拖曳的作用。

LOWER THERMOSPHERIC NEUTRAL WIND FIELD AT CHINESE ARCTIC YELLOW RIVER STATION RESPONSE TO AN INTERPLANETARY SHOCK

Interplanetary shocks can have a great impact on the thermospheric space environment through interaction with the thermosphere. We report the behavior of lower thermospheric neutral wind field at the Chinese Arctic Yellow River Station (78.92°N, 11.93°E) using data collected by the All-sky Fabry-Perot Interferometer (All-sky FPI) for observations of the 557.7 nm oxygen atom layer (about 97 km) on November 26 and 28, and December 1, 2011, and compare these data to those for the neutral atmosphere horizontal wind field and Horizontal Wind Model 2007 (HWM07) for the same period. We report the horizontal wind field can change dramatically in both magnitude and direction within 30 minutes of interplanetary shocks being monitored by ACE satellites; causes of change may be related to Joule heating. Analysis of the sight wind field(the direction is from All-sky FPI to the observed thermosphere atmosphere) at 557.7 nm oxygen atom layer on November 28 suggests ion drag can also affect wind field actions during interplanetary disturbances.